This paper summarizes the development and research situation of active energy-saving technologies in green building, analyzes the existing problems in the development of active energy-saving technologies in China, and puts forward the scientific selection methods and development direction of active energy-saving technologies. provides a basis to the research of activing energy-saving building technology.

Energy saving technology is playing an increasingly important role in green building. This paper summarizes the development of green building energy-saving technology at home and abroad. Based on the case of Suzhou Mingxin Environmental Science and Technology Building, uses digital simulation software for light insulation, insulation performance of exterior, annual load situation. The paper analyzes the application effect of energy saving technology in this case, combines the theory with case, compares the influencing factors, and puts forward suggestions to improve the indoor health environment, which is the reference for the further development of green building in China.

The general contracting project of 3D parking lot puts forward high requirement for deepening design, collaborative construction and operation management. The project mainly focuses on the combination of the key content of each node with BIM technology organically to fully play its value. During the planning stage, the quantitative simulation analysis is carried out to ensure the rationality of site selection. During the design stage, multi-professional collaborative design is carried out to ensure the depth of design. Also, full pipeline optimization is carried out to ensure the net height of parking lots, and comprehensive structural stress analysis is carried out to ensure safety performance requirements. During the virtual construction progress, construction simulation, cost control and quality control cover all aspects of design and construction management, which ensures the successful implementation of the project. Based on the BIM model, secondary development is conducted to achieve the data transmission and information inter-connection between the hardware and software. The BIM-based intelligence parking management system improves the operation and comprehensive management level of the parking lot, and optimizes the technical and economic indicators of the whole life cycle of the project.

By the fine design of BIM and using a unified data source, the sustainability of the whole process of the design data can be maintained, the design can be optimized, and the design works can achieve the requirements of green building. Besides, digital simulation software are used to stimulate and analyze the lights, the winds, the environments, the load, and the personnel evacuation through Ecotect, Fluent, Abaqus and Pathfinder. The results of simulation can optimize building window, the building shading, the building aseismicity, and the evacuation of buildings and renewable energy utilization as well. This method not only improves the design quality but also ensures the design of safety and energy saving, and eco-friendly sustainability, which facilitates the library′s indoor and outdoor environment for both study and life, and thus realizes the harmony among human beings, the architecture and the nature.